Tony Crocker wrote:Mary Jane
is the answer you are looking for.
When coming down Berthod Pass the first big possible turn (left turn) entrance to WP ski are is the Mary Jane side. It has both parking lots at the lodge, but also several other lots that touch the ski slopes that you can throw on your boots at the car then ski down to the lodge and buy a ticket (I assume it's not on Max pass?) if the main lot near the lodge is full (probably unlikely unless it is a powder day).
That will save you all the hassles of using the Winter Park side lots/gondola/shuttles/walking though the 'village', etc.. if you are only doing a half day. And no it has never made sense for decades that the ski area still likes to refer to itself as two separate entities (Winter park and Mary Jane ski areas as though they are somehow two different places). The 7 sector, multi-colored trail map can also be far more confusing than needed they way they present the ski slopes.
FYI Steamboat late last week (per someone who was there) was getting quite thin and skied off in a lot of areas from the Christmas hordes. Not sure the timing of your trip, but hope more natural snow can start falling, we need it.